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Short-Term Borrowings - Schedule of Short-Term Borrowings (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Short-term Debt [Line Items] |  |
Securities sold under agreements to repurchase | $ 183,289 | $ 209,795
FHLB advances | 208,000 | 185,000
Total short-term borrowings | 391,289 | 394,795
FHLB Advances |  |
Short-term Debt [Line Items] |  |
Total short-term borrowings | 208,000 | 185,000
Highest month-end balance | 208,000 | 185,000
Short-term Debt, Average Outstanding Amount | $ 23,924 | $ 15,694
Weighted-average interest rate: |  |
As of year-end | 1.64% | 0.80%
Paid during the year | 1.16% | 0.63%
Securities Sold under Agreements to Repurchase [Member] |  |
Short-term Debt [Line Items] |  |
Total short-term borrowings | $ 183,289 | $ 209,795
Highest month-end balance | 230,905 | 248,277
Short-term Debt, Average Outstanding Amount | $ 205,269 | $ 224,763
Weighted-average interest rate: |  |
As of year-end | 0.41% | 0.17%
Paid during the year | 0.35% | 0.16%

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- Definition Amount of advances from Federal Home Loan Bank (FHLBank) maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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- Definition Amount of borrowings classified as other, maturing within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(a)(7)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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